Examinando por Autor "Schultz, Eric T."

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    A Deep Dive into the Trophic Ecology of Engraulis ringens: Assessing Diet Through Stomach Content and Stable Isotope Analysis
    (Multidisciplinary Digital Publishing Institute (MDPI), 0024-12) Cárcamo, Carolina; Schultz, Eric T.; Leiva, Francisco; Saavedra, Alvaro; Klarian, Sebastian A.
    Our study investigates the trophic ecology of the anchoveta (Engraulis ringens). The anchoveta plays a key role in the Greater Humboldt Ecosystem and is extensively exploited by countries from the south-eastern Pacific Ocean. For a comprehensive study of trophic ecology, we employed a combined approach that included stomach content analysis, stable isotope analysis, and scaled mass index of body condition. Our results showed that the multivariate composition of the diet varies significantly between life stage and fishing zones in Chile. Copepods and euphausiids emerged as the dominant prey found in the stomachs across all fisheries zones. Stable isotope analysis revealed significant differences among different zones. The scaled mass index values were higher in the northern zone compared to the southern zones, for both juveniles and adults. This research carries significant implications for fisheries management and conservation efforts, such as the development of targeted management strategies that address variations in the trophic structure of anchoveta across different life stages and fishing zones. © 2024 by the authors.
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    Evaluating food metrics of lanternfshes in waters of the southeastern Pacifc Ocean
    (2023-02) Cárcamo, Carolina; Espinoza, Pepe; Canales‑Cerro, Carlos; Curaz‑Leiva, · Stephanny; Guzman‑Castellanos, Ana Brisca; Quintanilla, Ivonne; Vargas, · Fernanda; Fernandoy, Francisco; Zuñiga, Mauricio; Galvez, Patricio; Vargas, Rene; Saavedra, · Álvaro; Harrod, Chris; Schultz, Eric T.; A. Klarian, Sebastian
    Using carbon and nitrogen stable isotope values, we analyzed the trophic position (TP) and the isotopic niche width of lanternfishes from three different areas in the Southern Pacific Ocean. Fishes from Perú had slightly higher δ13C values compared with fish from Chilean areas. In contrast, δ15N values increased with latitude (North to South). Myctophids TP differed between the three study areas (highest in Central Chile, lowest in Peru). Peruvian fishes had a smaller isotopic niche than the lanternfishes of those from Chile. © 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.